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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What happens when a light bulb is unscrewed in a series circuit?
All other light bulbs will turn off due to the series circuit being broken. The electrons cannot travel all the way through, hence the current will also not flow in the circuit, switching off all the other bulbs too.
CommentIt's worth pointing out that the full supply voltage will then appear across the lamp holder -so take care!Why is the cathode ray tube's filament made of tungsten?
Because tungsten has a high melting point. This allows it to be heated red/white hot without melting. This high temperature results in the thermionic emission (boiling off) of electrons which are needed for the CRT to work.
Tungsten also has a low vapour pressure at high temperatures, so it won't evaporate too quickly, and it is relatively cheap.
Why pentavalent or trivalent impurities are used in p-n junction?
To increase the conductivity of diode
Why collector is made wider than emitter and base?
The collector handles huge currents as well as connected to High potential(i.e. Vcc). So It is handling very high power. In order to dissipate this power the area should be large according to Stefen's law of radiation.
Why is it dangerous to pass to much current through the mains cable?
Current or AMPS are what the appliance draws or load of the appliance. So, if you have a say 10,000 amps going thru a cable rated for say 1,000 amps , guess what ,the cable over heats and either will melt or at least catch fire.
A: Is term to describe the property of material to retain its property for after alterations. Like a magnet will retain its property if exposed closeness to iron.
Why is the substrate in nmos connected to ground and in pmos to vdd?
we try to reverse bias not the channel and substrate but we try to maintain the source,drain junctions reversed biased with respect to the substrate so that we dont loose our current in the substrate.
What is the phase angle between voltage and current in a purely capacitive circuit?
Current leads voltage (or voltage lags current) by 90° in a purely capacitive circuit. Try to remember it this way: capacitors resist change in voltage, hence the voltage lags (they resist voltage change because the voltage first goes to charging up the electric field in the capacitor).
Inductors resist change in current (energy in an inductor is in the form of magnetic fields, which are caused by the current through the wire). Remember an inductor is a coil (like an electromagnet, or a transformer).
What are the selection parameters for voltage regulator?
A: Usually the output voltage required. plus the regulation. But invariably the total current requirement becomes more preeminent. The other consideration is the maximum voltage input it can sustain without damage. Finally any three terminal regulator can be increased in voltage output with the proper bias so the output voltage is not a major concern
How do you increase the value of a capacitor?
A: Any additional capacitor added in parallel will effectively increase to total capacitance by that value. Note that additional capacitor added must have the same voltage rating as the other
What are the advantages and disadvantages of variable power supply?
A: A variable power supply has no disadvantage since it can replace a fix power supply. The disadvantage will rest with the additional cost to make one.
What is the vce in dc load line?
A: Vce is the voltage that will follow a particular load line. It is linear by itself but not related to the base drive.
Which starting system component uses a small amount of current to control a large amount of current?
I think its a starter solenoid or a relay. I know relays take high voltage current to power low voltage circuits.
Hope that helps..
Why CE mode amplifier is preferred over CB and CC?
CE gives high gain and amplification as compared to CB and CC. That's why its preferred.
input and output resistance moderate value,so many stages coupled to each other without using any additional impedence matching circuit.so maximum power transfer takes place from one stage to another.
THAT'S why it is preffered.
Does the flux changes due to change in the load in a transformer?
Yes, the two things that chage the number of flux lines in a transformer(electromagnet) are the number of turns in the windings and the amount of current flow
Why does transformer draws current when secondary is kept open?
A: If the transformer is connected to a power input of course it will draw current. The primary is a long wire it has own resistance wrap around an iron core. Of course there will be primary current whether there is a load on the secondary or not.
pres CTRL+J at the gate and if you are in the correct type of plane for that gate. Some free downloadable aircraft are not recognised by the jetway system and will not respond.
What does the peak value of an alternating voltage compare to its quoted value?
Assuming "quoted value" to be RMS value, or average, [what you would see on a meter], the peak would be that value times 1.414. Going backward, peak times .707 is RMS.
